How does component rendering occur in Jetpack Compose?

In Jetpack Compose, component rendering occurs declaratively and reactively.

When the state that the UI depends on changes, Compose automatically recalculates and updates only those parts of the interface that depend on the changed data.

Main steps of rendering:

1. Composition — calling @Composable functions that describe the UI.
2. State remembering — Compose tracks which data is used in each component.
3. Recomposition — when the state changes, Compose re-invokes only those functions where data has changed.
4. Drawing — updating the UI on the screen with minimal changes.

Example:

@Composable
fun Greeting(name: String) {
    Text(text = "Hello, $name!")
}

// When name changes, Compose will recalculate and update only this Text

Thus, Compose optimizes performance by updating the interface efficiently and minimally.